CONCORD, N.H. (AP) — New Hampshire’s unique hallmark of spring — ice-out on Lake Winnipesaukee — has been declared, the earliest on record.

Ice-out signals when the M.S. Mount Washington cruise ship can leave its Meredith winter dock and travel the state’s largest lake unimpeded by ice floes.

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Before Friday’s announcement, the earliest recorded Ice-Out was in 2010, when it was called on March 24.

Before that, the earliest ice-out recorded was on March 29, 1921.

The latest ice-out was called May 12, 1887.

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Ice-out is determined by air from by Emerson Aviation.

The Mount Washington’s first public cruise is the annual Mother’s Day.

Each year the 230-foot boat offers daily scenic cruises as well as evening dinner and dance cruises from the ship’s summer homeport of Weirs Beach.

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Copyright 2012 The Associated Press.